Elect Code Calc Lvl II - NEC Lesson 3:
Range and Appliance Calculations Exam
Questions And Answers
The minimum branch-circuit rating for a household range rated 8
3/4 kilowatts shall not be less than ? . -
correct answer ✅40A
210.19(C)
When a household wall-mounted oven is tapped from a 50-ampere
branch circuit, the ampacity of the tap conductors shall not be less
than ? . -
correct answer ✅20A
210.19(C) Exception No. 1
The minimum size neutral conductor permitted for a household
wall-mounted oven, electric range, or cooking unit rated 8 3/4
kilowatts or larger is ? . -
correct answer ✅10AWG
210.19(C) Exception No. 2
The neutral feeder demand for household electric ranges is
permitted to be ? of the feeder demand for the ungrounded
conductors. -
correct answer ✅70%
,Elect Code Calc Lvl II - NEC Lesson 3:
Range and Appliance Calculations Exam
Questions And Answers
220.61(B)
What is the ungrounded conductor feeder demand for one 10-
kilowatt household range installed in a dwelling unit? -
correct answer ✅8000
What is the ungrounded conductor feeder demand for two 10-
kilowatt household ranges in a dwelling unit? -
correct answer ✅11000
What is the ungrounded conductor feeder demand for household
electric ranges installed in a four-unit multifamily dwelling when
the ranges are rated 8.8 kilowatts, 9 kilowatts, 10 kilowatts, and 12
kilowatts? -
correct answer ✅4 ranges not over 12 kW
Table 220.55, Note 2 and Column C4 ranges = 17 kW
Line = 17 kW or 17,000 VA
The
correct answer is: 17000
, Elect Code Calc Lvl II - NEC Lesson 3:
Range and Appliance Calculations Exam
Questions And Answers
What is the ungrounded conductor feeder demand for two 14-
kilowatt household electric ranges installed in a dwelling unit? -
correct answer ✅Table 220.55, Note 1
14 kW exceeds 12 kW by 2
Increase 5% per kW over 12
100% + (2 × 5%) = 110%
Table 220.55, Column C
2 ranges = 11 kW
Line = 11 kW × 1.10
= 12.1 kW or 12,100 VA
The
correct answer is: 12100
Based on single-phase feeders for household range loads rated in
volt-amperes (VA) for the ungrounded conductors of a single-phase
system, identify the Code compliant minimum rating in volt-
amperes for the grounded conductor of each feeder. -
correct answer ✅8,000 VA line-to-line demand → 5,600 VA neutral
demand
11,000 VA line-to-line demand → 7,700 VA neutral demand
Range and Appliance Calculations Exam
Questions And Answers
The minimum branch-circuit rating for a household range rated 8
3/4 kilowatts shall not be less than ? . -
correct answer ✅40A
210.19(C)
When a household wall-mounted oven is tapped from a 50-ampere
branch circuit, the ampacity of the tap conductors shall not be less
than ? . -
correct answer ✅20A
210.19(C) Exception No. 1
The minimum size neutral conductor permitted for a household
wall-mounted oven, electric range, or cooking unit rated 8 3/4
kilowatts or larger is ? . -
correct answer ✅10AWG
210.19(C) Exception No. 2
The neutral feeder demand for household electric ranges is
permitted to be ? of the feeder demand for the ungrounded
conductors. -
correct answer ✅70%
,Elect Code Calc Lvl II - NEC Lesson 3:
Range and Appliance Calculations Exam
Questions And Answers
220.61(B)
What is the ungrounded conductor feeder demand for one 10-
kilowatt household range installed in a dwelling unit? -
correct answer ✅8000
What is the ungrounded conductor feeder demand for two 10-
kilowatt household ranges in a dwelling unit? -
correct answer ✅11000
What is the ungrounded conductor feeder demand for household
electric ranges installed in a four-unit multifamily dwelling when
the ranges are rated 8.8 kilowatts, 9 kilowatts, 10 kilowatts, and 12
kilowatts? -
correct answer ✅4 ranges not over 12 kW
Table 220.55, Note 2 and Column C4 ranges = 17 kW
Line = 17 kW or 17,000 VA
The
correct answer is: 17000
, Elect Code Calc Lvl II - NEC Lesson 3:
Range and Appliance Calculations Exam
Questions And Answers
What is the ungrounded conductor feeder demand for two 14-
kilowatt household electric ranges installed in a dwelling unit? -
correct answer ✅Table 220.55, Note 1
14 kW exceeds 12 kW by 2
Increase 5% per kW over 12
100% + (2 × 5%) = 110%
Table 220.55, Column C
2 ranges = 11 kW
Line = 11 kW × 1.10
= 12.1 kW or 12,100 VA
The
correct answer is: 12100
Based on single-phase feeders for household range loads rated in
volt-amperes (VA) for the ungrounded conductors of a single-phase
system, identify the Code compliant minimum rating in volt-
amperes for the grounded conductor of each feeder. -
correct answer ✅8,000 VA line-to-line demand → 5,600 VA neutral
demand
11,000 VA line-to-line demand → 7,700 VA neutral demand
